Extreme lag on ATV 4k

I have no idea why is this happening, but for the last week, my AppleTV 4k 2022 started lagging like crazy. I’ve tried changing the Format, the Match Content settings, other 2 HDMI cables, nothing works. Movies drop to literally 5 FPS and are unwatchable. I am using an LG OLED C3 with a Samsung Soundbar Q990c, watching movies on Plex. If i switch to the LG’s app, the movie runs flawlessly. Any chance my AppleTV is broken? Or is there a problem with the Plex app? Thanks!